Provided is a sensor device that detects a predetermined state quantity, including: a correction unit that performs first detection and second detection having a smaller generated state quantity than the first detection, and that corrects a detection value of the first detection, based on a detection value of the second detection.

A method of controlling a continuously variable electric drivetrain (CVED) including a high ratio traction drive transmission and at least one of a first motor-generator and a second motor-generator is disclosed. The method includes the steps of receiving a output speed, determining a kinematic output speed, and determining a slip state of the high ratio traction drive transmission based on a comparison of the output speed to the kinematic output speed.

Conditioning monitoring is provided for rotating components in gearboxes that accounts for gear system dynamics, allowing for improved analysis. A rotation rate for the component is generated from vibration data by estimating the rotation rate based on a tachometer measurement of another shaft and the shaft ratio. This estimated rotation rate is used, together with the known configuration of the component, to estimate a known gear mesh frequency of the component. By filtering for a range of frequencies around the gear mesh frequency based on variation in the shaft rate, the gear mesh frequency can be determined and from that signal, an actual rotation rate for the component can be determined. The actual or determined rotation rate can then be used in deriving an analytic vibration spectrum for the component that is not degraded due to gear system dynamics effects.

A cycloidal transmission for a drive includes a housing, a drive shaft, an eccentric, a cam plate, a pin plate, an output shaft, and a torque detection mechanism. The housing includes a first bearing, a second bearing, and a rolling ring. The drive shaft is rotatably mounted in the first bearing. The eccentric is fixedly connected to the drive shaft. The cam plate is driven by the eccentric. The cam plate is configured to roll in the rolling ring. Pins of the pin plate are configured to engage holes of the cam plate, so that the pin plate is driven by the cam plate. The output shaft is fixedly connected to the pin plate. The output shaft is rotatably mounted in the second bearing. The torque detection mechanism is between the first bearing and the second bearing and configured to detect the torque of the output shaft.

An estimation device includes mixed amount acquisition part 110, 201 configured to acquire a foreign matter mixed amount in a fluid that lubricates meshing elements G1 to G4, a fatigue damage degree estimation unit 202 configured to estimate fatigue damage degrees received by the meshing elements G1 to G4 per unit traveling of a vehicle based on the acquired foreign matter mixed amount, and a cumulative fatigue damage degree estimation unit 203 configured to estimate cumulative fatigue damage degrees of the meshing elements G1 to G4 based on the estimated fatigue damage degrees and at least one of a traveling distance and traveling time of the vehicle.

A gear assembly includes a first gear and a second gear. The first gear rotates about a first axis, and includes a first plurality of teeth and a first surface extending circumferentially and carried by the first plurality of teeth. The first surface is electrically conductive. The second gear rotates about a second axis and is operably connected to the first gear. The second gear includes an electrically conductive element, a second plurality of teeth, and a second surface extending circumferentially and carried by the second plurality of teeth. The second surface is electrically nonconductive. The electrically conductive element includes a plurality of feelers with each feeler projecting radially outward and into a respective tooth of the second plurality of teeth.

A planetary reducer contains: a sun gear rod, a gear assembly, a first external gear, and a second external gear. The sun gear rod includes an extension and a toothed section. The gear assembly includes a post, a first planetary gear, and a second planetary gear. Some of multiple teeth of the first planetary gear and some of multiple teeth of the second planetary gear expose outside the post. A number of the multiple teeth of the first planetary gear is different from a number of the multiple teeth of the second planetary gear. The first external gear includes a first surrounding portion and a first toothed portion which meshes with the first planetary gear. The second external gear includes a second surrounding portion and a second toothed portion which meshes with the second planetary gear.

A method for identifying a critical error of a worm gear machine, step 1: obtaining an actual forward kinematic model T.sub.27.sup.a and an ideal forward kinematic model T.sub.27.sup.i from a coordinate system of a worm gear hob to a coordinate system of a worm gear, thereby establishing a geometric error-pose error model of the worm gear machine; step 2: regarding the geometric error-pose error model of the worm gear machine as a multi-input multi-output (MIMO) nonlinear system, and solving, by taking the geometric error of each motion axis of the worm gear machine as an input feature X, and a pose error between the worm gear hob and the worm gear as an output variable Y, an importance coefficient of each input feature with a random forest algorithm; and step 3: determining a critical error affecting a machining accuracy of the worm gear machine.

A sensor is used in measuring the torque applied to a slew drive. The slew drive includes a worm gear and a worm wheel and the sensor is coupled with a securing device that is used to secure the worm gear to the slew drive housing. The sensor generates a signal which is indicative of the torque on the worm wheel. The worm gear is secured to the slew drive housing by a first bearing and a second bearing. Two end plates and eight bolts are also used to further secure the worm gear and the bearings to the slew drive housing. By tightening the bolts, a compressive force is applied on the worm gear through the bearings. The applied torque on the worm wheel causes an axial force on the worm gear. The axial force is transmitted through the worm gear, the bearings, the end plates, and the bolts. One or more sensors can be embedded in one or more of the end plates or the bolts to measure the strain, in the end plates or the bolts, due to the axial force. A control device receives the signal from the sensor and stores, analyses, and/or communicates the signal.

A wind park controller and control method for a wind park (10) are described. The wind park comprises a plurality of wind turbines (20) and an Energy Storage System (24) connected to one another by means of a low voltage power network (22, 25), which is in turn coupled to the grid. The controller determines a number of operating parameters of the wind turbine gearbox or drive train, and calculates a gearbox or drive train health metric. This can include a measure of the gearbox lifetime. The controller also determines one or more power characteristics of the wind turbine generator or the point of common coupling (26) to determine a power mismatch indication. Based on the power mismatch indication and said gearbox or drive train health metric, the controller determines a power command for the Energy Storage System and wind turbines based to improve the gearbox health and lifetime.